I agree on the brown roan. He just seems to be a little more of a 'minimal' expression than you usually see. Fun fact, brown roan is also called Purple Roan! At least in some places anyway, I always thought that was pretty neat.
(By the way I -LOVE- that bright orange halter and lead! I wanted to get a halter that color for my paint gelding but never could find a darn place that sold them.)